Method of synchronizing an independent data device of a...

Details Method of synchronizing an independent data device of a... Method of synchronizing an independent data device of a...

2007-08-07

2007-08-07

Bayard, Emmanuel (Department: 2611)

Pulse or digital communications

Synchronizers

C375S340000

Reexamination Certificate

active

10814824

ABSTRACT:
An incident signal contains a preamble including a training sequence having a series of pulses whose polarity and time shifts are defined by respective polarity code and time-hopping code. A method includes a digital cross-correlation of the received signal with the training sequence. The cross-correlation algebraically sums in accordance with the polarity code windows of the received signal. The starting points of the windows are determined by the time-hopping code. The cross-correlation further includes detecting the end point of the preamble from the result of the digital cross-correlation. When the size of the receiving buffer, i.e., the size of the window is smaller than the number N of samples of each replica of the training sequence, it is particularly advantageous that the digital cross-correlation be performed iteratively in a block-by-block fashion. The computation of each block is split into M slices which are computed by algebraically summing windows N/M samples long.

REFERENCES:
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patent: 6925131 (2005-08-01), Balakrishnan et al.
patent: 2002/0181407 (2002-12-01), Khullar et al.
patent: 02/052740 (2002-07-01), None
patent: 03/009608 (2003-01-01), None
Win et al., Ultra-Wide Bandwidth Time-Hopping Spread-Spectrum Impulse Radio for Wireless Multiple-Access Communications, IEEE Transactions on Communications, IEEE Inc., New York, US, vol. 48, No. 4, Apr. 2000, pp. 679-691, XP000932191.

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